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Date: Fri, 17 Oct 2008 14:24:24 -0600
From: Andreas Dilger <adilger@....com>
To: "Theodore Ts'o" <tytso@....edu>
Cc: Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] ext4: Remove automatic enabling of the HUGE_FILE feature
flag
On Oct 17, 2008 09:27 -0400, Theodore Ts'o wrote:
> If the HUGE_FILE feature flag is not set, don't allow the creation of
> large files, instead of automatically enabling the feature flag.
> Recent versions of mke2fs will set the HUGE_FILE flag automatically
> anyway for ext4 filesystems.
>
> Signed-off-by: "Theodore Ts'o" <tytso@....edu>
Took a second to grok the change, but it looks OK.
Acked-by: Andreas Dilger <adilger@....com>
> ---
> fs/ext4/inode.c | 24 ++++-----------
> fs/ext4/super.c | 85 +++++++++----------------------------------------------
> 2 files changed, 21 insertions(+), 88 deletions(-)
>
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 27fc6b9..8dbf695 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -4194,7 +4194,6 @@ static int ext4_inode_blocks_set(handle_t *handle,
> struct inode *inode = &(ei->vfs_inode);
> u64 i_blocks = inode->i_blocks;
> struct super_block *sb = inode->i_sb;
> - int err = 0;
>
> if (i_blocks <= ~0U) {
> /*
> @@ -4204,36 +4203,27 @@ static int ext4_inode_blocks_set(handle_t *handle,
> raw_inode->i_blocks_lo = cpu_to_le32(i_blocks);
> raw_inode->i_blocks_high = 0;
> ei->i_flags &= ~EXT4_HUGE_FILE_FL;
> - } else if (i_blocks <= 0xffffffffffffULL) {
> + return 0;
> + }
> + if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE))
> + return -EFBIG;
> +
> + if (i_blocks <= 0xffffffffffffULL) {
> /*
> * i_blocks can be represented in a 48 bit variable
> * as multiple of 512 bytes
> */
> - err = ext4_update_rocompat_feature(handle, sb,
> - EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
> - if (err)
> - goto err_out;
> - /* i_block is stored in the split 48 bit fields */
> raw_inode->i_blocks_lo = cpu_to_le32(i_blocks);
> raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32);
> ei->i_flags &= ~EXT4_HUGE_FILE_FL;
> } else {
> - /*
> - * i_blocks should be represented in a 48 bit variable
> - * as multiple of file system block size
> - */
> - err = ext4_update_rocompat_feature(handle, sb,
> - EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
> - if (err)
> - goto err_out;
> ei->i_flags |= EXT4_HUGE_FILE_FL;
> /* i_block is stored in file system block size */
> i_blocks = i_blocks >> (inode->i_blkbits - 9);
> raw_inode->i_blocks_lo = cpu_to_le32(i_blocks);
> raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32);
> }
> -err_out:
> - return err;
> + return 0;
> }
>
> /*
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 95127f0..9b2b2bc 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -374,66 +374,6 @@ void ext4_update_dynamic_rev(struct super_block *sb)
> */
> }
>
> -int ext4_update_compat_feature(handle_t *handle,
> - struct super_block *sb, __u32 compat)
> -{
> - int err = 0;
> - if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) {
> - err = ext4_journal_get_write_access(handle,
> - EXT4_SB(sb)->s_sbh);
> - if (err)
> - return err;
> - EXT4_SET_COMPAT_FEATURE(sb, compat);
> - sb->s_dirt = 1;
> - handle->h_sync = 1;
> - BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
> - "call ext4_journal_dirty_met adata");
> - err = ext4_journal_dirty_metadata(handle,
> - EXT4_SB(sb)->s_sbh);
> - }
> - return err;
> -}
> -
> -int ext4_update_rocompat_feature(handle_t *handle,
> - struct super_block *sb, __u32 rocompat)
> -{
> - int err = 0;
> - if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) {
> - err = ext4_journal_get_write_access(handle,
> - EXT4_SB(sb)->s_sbh);
> - if (err)
> - return err;
> - EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat);
> - sb->s_dirt = 1;
> - handle->h_sync = 1;
> - BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
> - "call ext4_journal_dirty_met adata");
> - err = ext4_journal_dirty_metadata(handle,
> - EXT4_SB(sb)->s_sbh);
> - }
> - return err;
> -}
> -
> -int ext4_update_incompat_feature(handle_t *handle,
> - struct super_block *sb, __u32 incompat)
> -{
> - int err = 0;
> - if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) {
> - err = ext4_journal_get_write_access(handle,
> - EXT4_SB(sb)->s_sbh);
> - if (err)
> - return err;
> - EXT4_SET_INCOMPAT_FEATURE(sb, incompat);
> - sb->s_dirt = 1;
> - handle->h_sync = 1;
> - BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
> - "call ext4_journal_dirty_met adata");
> - err = ext4_journal_dirty_metadata(handle,
> - EXT4_SB(sb)->s_sbh);
> - }
> - return err;
> -}
> -
> /*
> * Open the external journal device
> */
> @@ -1771,13 +1711,13 @@ static void ext4_orphan_cleanup(struct super_block *sb,
> *
> * Note, this does *not* consider any metadata overhead for vfs i_blocks.
> */
> -static loff_t ext4_max_size(int blkbits)
> +static loff_t ext4_max_size(int blkbits, int has_huge_files)
> {
> loff_t res;
> loff_t upper_limit = MAX_LFS_FILESIZE;
>
> /* small i_blocks in vfs inode? */
> - if (sizeof(blkcnt_t) < sizeof(u64)) {
> + if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
> /*
> * CONFIG_LSF is not enabled implies the inode
> * i_block represent total blocks in 512 bytes
> @@ -1807,7 +1747,7 @@ static loff_t ext4_max_size(int blkbits)
> * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
> * We need to be 1 filesystem block less than the 2^48 sector limit.
> */
> -static loff_t ext4_max_bitmap_size(int bits)
> +static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
> {
> loff_t res = EXT4_NDIR_BLOCKS;
> int meta_blocks;
> @@ -1820,11 +1760,11 @@ static loff_t ext4_max_bitmap_size(int bits)
> * total number of 512 bytes blocks of the file
> */
>
> - if (sizeof(blkcnt_t) < sizeof(u64)) {
> + if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
> /*
> - * CONFIG_LSF is not enabled implies the inode
> - * i_block represent total blocks in 512 bytes
> - * 32 == size of vfs inode i_blocks * 8
> + * !has_huge_files or CONFIG_LSF is not enabled
> + * implies the inode i_block represent total blocks in
> + * 512 bytes 32 == size of vfs inode i_blocks * 8
> */
> upper_limit = (1LL << 32) - 1;
>
> @@ -1933,7 +1873,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
> int blocksize;
> int db_count;
> int i;
> - int needs_recovery;
> + int needs_recovery, has_huge_files;
> __le32 features;
> __u64 blocks_count;
> int err;
> @@ -2074,7 +2014,9 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
> sb->s_id, le32_to_cpu(features));
> goto failed_mount;
> }
> - if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
> + has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
> + EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
> + if (has_huge_files) {
> /*
> * Large file size enabled file system can only be
> * mount if kernel is build with CONFIG_LSF
> @@ -2124,8 +2066,9 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
> }
> }
>
> - sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits);
> - sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
> + sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
> + has_huge_files);
> + sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
>
> if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
> sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
> --
> 1.5.6.1.205.ge2c7.dirty
>
> --
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Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.
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